How Radon Reaches Groundwater in Mercer County Aquifers
Radon originates naturally from underground rocks and soils
Radon-222 is a radioactive gas produced by the decay of uranium in the earth's crust. In Mercer County, groundwater aquifers pass through rock formations that release radon into water over time.
The gas dissolves directly into water held in wells
When water infiltrates radon-containing soils and bedrock, radon gas can dissolve into it. This means wells drawing from Mercer County aquifers often contain measurable radon levels.
How a Certified Lab's Radon Test Reports Are Structured
Test results express radon concentration in picocuries per liter (pCi/L)
Laboratory analysis quantifies the amount of radon present in water samples, reported as pCi/L. This measures the radioactivity per liter of water.
Results include values for individual wells, medians, and ranges
Because radon varies by location and depth, labs summarize data using minimum, maximum, and median figures from a set of samples.
Understanding 'Detected', 'Median', and 'Range' in Mercer County Sampling
'Detected' means radon was measured above the lowest reporting level
Every sample taken from Mercer County wells showed radon levels above detection limits; none were below, indicating consistent presence in aquifer water.
'Median' in this dataset is 170 pCi/L from 6 sampled wells
This median is the middle concentration value, balancing the higher and lower results found between 10 to 700 pCi/L.
'Range' shows observed concentrations from 10 to 700 pCi/L
The wide range reflects natural variability in well depth and geology across Mercer County but does not specify any health risk for individual wells.
Additional Considerations for Commercial or Industrial Water Users
Larger water use volumes may require ongoing radon monitoring
Commercial users should verify if radon concentrations fluctuate with seasonal or operational changes, as larger water volumes can affect exposure levels.
Regulatory standards and compliance reporting may apply
Businesses may have different reporting obligations or federal guidelines based on water use type compared to residential households.
Interpreting Mercer County Radon Results Against Federal Guidelines
No sampled well exceeded federal radon thresholds as of mid-2024
Government results from six area wells all fell below the established federal standard for radon in water, a health-based reference level.
These findings do not determine any individual household's water radon concentration
Because these measurements represent regional sampling, actual radon levels in a specific household’s well can only be known through an individual test.
How Depth of Sample Wells Influences Expected Radon Levels
Sampled wells ranged from 53 to 238 feet deep, affecting radon variation
Deeper wells sometimes encounter different rock formations, which can increase or decrease dissolved radon compared to shallower wells.
Knowing your well's depth helps frame what regional data might mean for you
Understanding how deep your source water is drawn can guide expectations for radon presence and treatment needs.
The U.S. Geological Survey sampled six wells in Mercer County’s aquifer between June and August 2024, detecting radon in every sample. These data provide a regional perspective on radon occurrence but do not define conditions in any one household well. Testing your own water is the only way to know your radon concentration. The C-Series Radon in Water Filter ships ready to configure as a documented solution that reduces radon dissolved in household water. For detailed data, consult the government source mapping Mercer County groundwater radon levels.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-08-20. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Radon-222 in the aquifer (Mercer County): 6 results from 6 wells, median 170.0 pCi/L, range 10.0-700.0 pCi/L; none above any federal threshold